Improvement in street-lamps



UNITED STATES PATENT i FIO'E.

FRANZ SCHUMANN, OF WASHINGTON, DISTRICT OF COLUMBIA, ASSIGNOR TO ALFREDB. MULLETT AND FRANZ SCHUMANN, OF SAME PLACE.

IMPROVEMENT IN STREET-LAMPS. A

' Specification forming part of Letters Patent No. 133,672, datedDecember 3, 187:2.

To all whom it may concern:

Be it known that I, FRANZ SCHUMANN, of WVashington, in the District ofColumbia, have invented an Improvement in Street and Hall Lamps, ofwhich the following is a specification:

The Nature and Object of the Invention- My invention relates to a modeof applying to an Argand or chimney lamp a series of reflectors, adaptedto intercept ascending rays and deflect them horizontally, the partsbeing so constructed and arranged that the customary inclosin g lanternmay be dispensed with.

' Description of the Accompanying Drawing.

Figure "l is a vertical section of a streetlamp with my inventionapplied, the line a: a, Fig. 2, indicating the plane of section. Fig. 2-is a horizontal section on the line y y, Fig. 1.

General Description. I

A may represent the upper part of a street lamp-post. From this rise anydesirable number of curved standards, B, surmounted by a cylinder, 0,which, in addition to its primary.

functions of constituting a portionof the .lamp-chimney and supportingthe compound hood D E F, hereinafter. described, serves also to connectand brace the upper ends of the standards. The number of the standardsmay be varied without departing from the principles of the invention. Inthe present illustration I have shown five standards connected at bottomby a ring or collar, G, which fits over the head of the lamp-post. Fromthe outer edges of the standards B arms H H 11 project outward andupward in vertical planes radial to the axis of the lamp. These arms aregrooved for the reception of the reflectors I I 1 which I prefer to makeof corrugated glass, backed with tin or suitably coated or prepared inany suitable manner. The ends of the arms H H H are connected bytie-bars J. Metallic plates, K K K are applied above the backs of thereflectors to protect them from injury.

The compound hood consists of conical caps D E, connected by a shortshaft or supplemental chimney, F, which is perforated at f f to allowthe escape of gases. The lower cap D being annular surrounds thechimney,

and is of sufficient size to completely cover the upper reflector andprotect it from rain or snow. The plates K K of the two lower rangesbeing located at a greater distance from the chimney will shed waterwithout injury to the apparatus or interference with the operation ofthe lamp. The upper cap-E completely covers the chimney and prevents theentrance of water at top. I

The burner L is preferably of the Argand type, the cylindrical glasschimney M being large enough to afi'ord ample room for the flame, andfitting within the lower end of the metallic chimney G. 4

By. an inspection of Fig. 1 of the drawing it will be observed that thepositions of the successive reflectors and their arrangement relativelyto each other and to the burner cause them to intercept all rays oflight passing through the glass chimney in an upward direction andreflect them horizontally. The reflectors offer no obstruction to thehorizontal rays, but utilize rays which would other wise be lost bypassing upward. The illuminating effect of the lamp, especially at adistance, is thus greatly increased.

I have represented the reflectors five-sided and in tiers of three,believing that this particular arrangement is as good as anyin combiningthorough effectiveness with economy of construction. The device may,however, be varied in both these respects, and in other non-essentialparticulars, as experience, preference, or special circumstances mayrender desirable, without departing from the essential principles of theinvention.

Claim.

I claim as new and desire to secure by Letters Patent- 7 Thesupporting-frame B G H J, reflectors I, burner L, and chimney M,constructed and arranged to operate in the manner and for the purposesset forth.

Witnesses:

OCTAVIUS KNIGHT, WALTER ALLEN.

F. SGHUM-ANN.

